I may be able to assist on the issue of Mainoaks fishing, as I am the owner of the cottages in question. PAAS do indeed own the fishing rights immediately opposite the cottages.
However, about 18-months ago we purchased a beautiful (and for many years unfished) stretch of the river wye about 1-mile upstream (on the opposite bank) of the cottages.
This fishing is provided FREE of charge for all guests staying at Mainoaks. To access it, if you're fit, you walk along the footpath on the opposite bank. If you're kitted-up, its a 5-min drive with parking, next to where the stretch starts. You can also fish at night.
There we have it: over 1,900 yards of prime untouched fishing, just waiting to be explored. So get your rods out!!
Holiday Cottages, Holiday Rental, Self catering cottage - Mainoaks Cottages